Answer:
2875
Explanation:
In a year, Sara will earn
2500 + 2500 * 5% *1 = 2500 + 125 = 2625 (5% numerically is 0.05)
In two years, Sara will earn
2500 + 2500 * 5% *2 = 2500 + 250 = 2750
In three years, she will earn
2500 + 2500 * 5%*3 = 2500 + 375 = 2875
2875 is the answer, however we can still yield this answer in a simple way
We can observe from the sequence of the years that there is a general formula. Indeed, there do exists a general formula and it is A = P(1+rt), where A is the earnings (2875), P is the principal amount (2500), r is the interest rate and t is the time period.
Applying the last formula we can find that:
A = 2500(1+0.05*3) = 2875